Quote:
Originally Posted by peafur
With fullframe sensor I can change it to DX and get reach up to 450mm.
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"Reach" only increases if pixel-density increases. The Canon 7D MkII and the 5DS-R have the same pixel-density, so they have the exact same "reach" even though one is crop-sensor and one is full-frame. A crop sensor only uses part of the image circle of a lens designed for full-frame, so that's exactly the same as cropping in RAW conversion.